River sediment typically acts a ‘sink’ or ‘source’ of phosphorus for the overlying water owing to the adsorption of phosphorous by the sediment or release of phosphorous to the water, respectively. In this study, a method is proposed for the determination of the equilibrium concentration of the total phosphorus (EC_TP) and total phosphorus release rate (R_r). Phosphorus release experiments were conducted on natural river sediments in flowing water with a low velocity under different water temperatures. An empirical equation was established for the correlation between EC_TP and R_r at an arbitrary temperature and at 20 °C. The results indicate that an increase in the water temperature significantly enhances the phosphorus release. In comparison with total phosphorus, dissolved phosphorus and particulate phosphorus in the overlying water do not change with the water temperature. Thus, the results of this study aid in understanding the contaminant exchange between sediments and water in flowing rivers.

由于沉积物分别吸收磷或将磷释放到水中，河流沉积物通常对上层水起到磷的“汇”或“源”作用。在这项研究中，提出了一种测定_总磷平衡浓度（EC _TP）和总磷释放速率（R _r）的方法。在不同水温下，以低速在流动水中的天然河流沉积物上进行了磷释放实验。建立了EC _TP和R _r之间相关性的经验方程在任意温度和20°C下。结果表明，水温的升高显着增强了磷的释放。与总磷相比，上覆水中的溶解磷和颗粒磷不会随水温变化。因此，这项研究的结果有助于理解流动河流中沉积物和水之间的污染物交换。